US3921971A - Suction device for separating and/or transporting sheets in a sheet-handling machine - Google Patents

Suction device for separating and/or transporting sheets in a sheet-handling machine Download PDF

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Publication number
US3921971A
US3921971A US484452A US48445274A US3921971A US 3921971 A US3921971 A US 3921971A US 484452 A US484452 A US 484452A US 48445274 A US48445274 A US 48445274A US 3921971 A US3921971 A US 3921971A
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United States
Prior art keywords
sheet
suction
piston
space
cylinder
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US484452A
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English (en)
Inventor
Karl-Hans Vollrath
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Polygraph Leipzig Kombinat Veb
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Polygraph Leipzig Kombinat Veb
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H3/00—Separating articles from piles
    • B65H3/08—Separating articles from piles using pneumatic force
    • B65H3/0808—Suction grippers
    • B65H3/0883—Construction of suction grippers or their holding devices

Definitions

  • the suction device includes a pneumatic cylinder and [73] Assignee: VEB Polygraph Leipzig Kombinat fur Polygraphische96 und a hollow piston in the cylinder movable between a re- Ausrustungen, Leipzig, Germany tracted and a non-retracted position and comprised of June 28, 1974 Appl. No.: 484,452
  • I108 cylinder is provided with a suction port opening into the second space to form a path for the flow of ambi- [56] References Cited FOREIGN PATENTS OR APPLICATIONS ent air into the suction opening and out through the suction port, the flow cross section of the first space being smaller than that of the second space so that the 716,791 United Kingdom................. 271/103 first space constitutes a flow restriction in such path.
  • the invention relates to a sheet-separating and/or sheet-transporting suction device of the type conventionally used in sheet-handling machinery, such as in printing machines, copying machines, and the like.
  • sheet-separating and/or sheet-transporting suction devices of this type are already known, especially for removing sheets from a stack of sheets, and for then feeding the successively removed sheets onto a conveyor which transports the sheets into a printing machine, or the like.
  • These sheet-separating and/or sheet-transporting suction devices are synchronized with the operations of the associated sheet-handling machine and are pneumatically controlled by the synchronized application and removal of operating suction.
  • This timed application and removal of operating suction is for example customarily synchronized with the movement of a holding arrangement on which one or more of such suction devices are mounted; for example, the suction devices engage the top sheet of a stack and the holding arrangement moves along a predetermined path to a location above a conveyor belt, whereupon the operating suction is removed and the sheet falls onto the conveyor belt, the holding arrangement then performing a return movement back to the stack for the engagement of the next sheet.
  • a compression spring holds a piston in the upper position thereof, the piston carrying the sheet-en gaging suction nozzle; between the suction chamber for the movement of the piston into the operating position, i.e., for the downward movement of the piston into Contact with the stack of sheets, and the suction chamber for the upwards movement of the piston upon closing off of the suction nozzle of the suction device by the actual sheet which is to be removed from the stack and/or transported or fed, there is formed a flow restriction passageso configurated that in the vicinity of the piston a bore is arranged in the piston rod.
  • the surface portions of the piston and those of the inner wall of the cylinder which contact each other during relative sliding movement therebetween must be of high quality material and manufactured in a very precise manner, with narrow tolerances.
  • Each of the known designs includes at least two working or slidingcontact surfaces, placing high demands upon the precision of the shape and mounting of the relatively movable parts; the necessarily narrow tolerances require a relatively complicated method of construction which is not advantageous from the manufacturers point of view.
  • One object of the invention is to provide a sheetseparating and/or sheet-feeding or -transporting suction device which avoids the disadvantages of the priorart devices.
  • Another object of the invention is to provide such a suction device which does not depart altogether from the basic structure of the prior-art devices, but which is different in respects which permit the manufacture of the suction device in an uncomplicated manner, in which relatively large tolerances are permissible, and which lends itself readily to the formation of the suction device from plastic.
  • it is considered very important tobe able to design a suction device of the type in question which operates on the pressure-difcan be made of plastic material in a simple manufacturing process, and which after being manufactured and installed requires virtually no maintenance.
  • the sheet-separating and/or -transporting and/or -feeding suction device is inherently of low mass and suitable for manufacture from plastic.
  • the arrangement of the suction release passage mentioned above has the advantage that when the suction-generating device is turned off, the suction within the suction device almost immediately terminates, so that the sheet being held by such suction force almost immediately drops; on the other hand, whenthe suction-generating device is on, the existence of the suction release passage does not detract from the reliability with which the sheet is held by the suction nozzle of the device.
  • the operating cycle of the sheet-separating and/or sheettransporting or feeding device can be gone through repeatedly with the very high precision and at very high speed.
  • Reference numeral 1 designates the cylinder of the sheet-transporting and/or -separating device.
  • a piston 2 integral with a piston rod 3.
  • the piston rod 3 and the piston 2 are provided with an internal suction conduit 3a.
  • the piston rod 3 is slidable in a relatively long piston rod guide member 4.
  • a compression spring 5 Arranged intermediate the piston 2 and the piston rod guide member 4 is a compression spring 5 which exerts upon the piston 2 a force tending to urge the latter to the uppermost, retracted position, shown in FIG. 1.
  • Thepiston rod 3 isprovided with a longitudinally extending recess 6 which together with the adjoining surface portions of the piston rod guide member 4 forms a suction release passage.
  • This suction release passage 6 extends from the sheet-engaging suction nozzle 8 up into the cylinderl and terminates shortly past the upper edge 7 of the piston rod guide member 4.
  • a single such suction release passage 6 it would also be possible to provide a plurality of such suction release passages, but with the combined flow cross-sections of all of the passages equalling the flow cross-section of the suction release passage used when only a single such passage is employed.
  • the sheetengaging suction nozzle 8 is arranged at the lower end of the piston rod 3 and is held in place by the radially compressive force of the surrounding elastic members, which for example are made of elastically resilient plastic; this manner of assembly makes for easy removal of the suction nozzle 8 and replacement by another such nozzle, when this is necessary.
  • the piston rod guide member 4 is secured to the cylinder l by means of one or more mounting screws 9, for
  • the cylinder 1 is provided with one or more mounting collars 10.
  • One such collar 10 (such as the one depicted in FIG. 1) can be made considerably longer than otherwise necessary, so as to form a mounting sleeve, and serve for the securing of the entire suction device to a (non-illustrated) supporting framework of a sheet transporting arrangement, or the like.
  • the member 4 has embedded therein one or more radially outwardly projecting pins ll.
  • the radially outwardly projecting pins 11 can be introduced into L-shaped slots 12 in the lower portion of the peripheral wall of the cylinder 1 to form with such L-shaped slots 12 bayonet-type connections.
  • the upper end of the cylinder 1 is provided on its inner surface with a plurality of abutment members 13 which serve to establish an upper end position for the piston 2 against the upwards pushing force of the compression spring 5.
  • the operating suction connector port 14 is so arranged on the lower part of the cylinder 1 that the piston 2 can be drawn by the force of suction down to the level of the upper edge 7 of the piston rod guide member 4.
  • annular clearance 15 Between the outer periphery of the piston 2 and the inner periphery of the cylinder 1 there is defined an annular clearance 15 the flow cross-sectional area of which is substantially smaller than the flow cross-sectional area of the space surrounding the piston rod 3a.
  • FIGS. 1-3 The structure depicted in FIGS. 1-3 operates as follows:
  • a suction-generating device connected to the operating suction connector port 14 is turned on, thereby establishing suction inside the cylinder 1. Air accordingly flows into the suction nozzle 8 through the suction passage 3a, radially outwards over the upper rim of piston 2, axially downwards through the annular clearance 15, axially downwards through the annular space surrounding the piston rod 3, and out through the operating suction' connector port 14. Also, air is initially drawn in through the suction release passage 6 and flows out through the suction connector port 14.
  • the sheet engaged by the suction nozzle 8 is still firmly held by the suction nozzle, and accordingly is lifted as the piston 2 moves upwards to its retracted position.
  • the suction release passage 6 becomes unblocked, and ambient air begins to flow through passage 6 into the interior of cylinder 1 and out through port 14; this flow of air, however, is relatively small.
  • the suction-generating device connected to port 14 is turned off. Ambient air enters into the cylinder 1 through the suction release passage 6.
  • the subambient pressure inside cylinder 1 very quickly rises to ambient pressure, and the sheet drops down from suction nozzle 8. It will be understood so that when the sheet thusly drops it will drop onto the conveyor belt and, for example, be fed into a copying the present invention.
  • the means for holding and moving the illustrated suction device are per se conventional; for example, the suction device could conceivably be mounted as shown in the drawing'on a guide track and driven by a (non-illustrated) drive chain back and forth between the stack and the conveyorbelt.
  • the flow cross-sectional area of the suction release passage 6 is so small, compared to that of port 14, that, even when passage 6 is fully unblocked, the sheet held by nozzle 8 will not be released until the operating suction applied to port 14 is removed.
  • the flow cross-sectional area of the passage 6 is sufficiently great, compared to the volume of cylinder 1 and taking into account the maximum suction developed, that when the suction applied to port 14 is removed the sheet held by nozzle 8 drops virtually immediately.
  • the compression spring 5 of course maintains the piston 2 in the uppermost, fully retracted position thereof.
  • a suction device for engaging and then holding sheets, comprising, in combination, a pneumatic cylinder; a hollow piston units in said cylinder movable between a retracted and a nonretracted position and comprised of axially adjacent first and second portion, at least a part of the circumferential periphery of each of said portions being spaced from and out of contact with the inner periphery of said cylinder to define therewith respective first and second spaces, said piston unit including a sheetengaging portion having a suction opening which communicates with the ambient atmosphere and co stitutes the end of the hollw interior of said piston unit,
  • said hollow interior communicating with said second space via said first space, said cylinder being provided with a suction port opening into said second space to form a path for the flow of ambient air into said suction opening and out through said port, the flow cross section of said first space being smaller than that of said second space so that said first space constitutes a flow restriction in said path; and drive means for causing said piston unit to move from retracted to nonretracted position and then back to retracted position, in order to cause said sheet-engaging portion to move into engagement with a sheet located in the path of movement of the latter and then hold said sheet by suction during the movement of said piston unit back to said retracted position, said drive'means comprising suction-generating means connected to said port and operativefor establishing subambient pressure in said secondspace, whereby said piston movesfrom said retracted to.
  • said piston returns to said retracted position due to the pressure equalization resulting when the sheet engaged and held by said'sheet-engaging portion blocks further entrance ,of ambient air into said suction opening of the said sheet-engaging portion
  • said first portion of said piston unit is cylindrical and constitutes a'hollow piston portion
  • said second portion of said piston unit is cylindrical and constitutes a hollow piston rod portion,and-wherein sa'idhollow piston portion is spaced from and out of contact with the inner periphery of'said'c'ylinder all around the circumferentialperiphery of said hollowpiston-portion', whereby there is no frictional wear of the circumferential surface of said piston portion and the facing inner surface of said cylinder
  • said cylinder is further provided with an axially extending guide portion for guiding said piston rodportion, said guide portion having an axial
  • first space is annular and wherein said second space is annular.
  • said first portion of said piston unit is cylindrical and constitutes a hollow piston portion and wherein said second portion of said piston unit is cylindrical and constitutes a hollow piston rod portion, and wherein said hollow piston portion is spaced from saidout of contact with the inner periphery of said cylinder all around the circumferential periphery of said hollow piston portion, whereby there is no frictional wear of the circumferential surface of said piston portion and, the facing inner surface of said cylinder, and wherein said cylinder is further provided with an axially extending guide portion for guiding said piston rod portion, said guide portion having an axial end portion facing said piston portion, and wherein said piston rod portion is further provided with a recess constituting a suction release passage having one end opening into the ambient atmosphere and having another end which terminates just past said axial end portions 'of said guide portion when said piston unit is in said retracted position.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sheets, Magazines, And Separation Thereof (AREA)
US484452A 1973-06-28 1974-06-28 Suction device for separating and/or transporting sheets in a sheet-handling machine Expired - Lifetime US3921971A (en)

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Application Number Priority Date Filing Date Title
DD171885A DD106018A1 (sv) 1973-06-28 1973-06-28

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US3921971A true US3921971A (en) 1975-11-25

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US (1) US3921971A (sv)
DD (1) DD106018A1 (sv)
DE (1) DE2409528C2 (sv)
IT (1) IT1014420B (sv)
SU (1) SU591336A1 (sv)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4480826A (en) * 1982-03-11 1984-11-06 Hamada Printing Press Mfg. Co., Ltd. Paper feeder
US4640503A (en) * 1984-05-28 1987-02-03 Veb Kombinat Polygraph "Werner Lamberz" Leipzig Sheet-separating and conveying suction device
US5582450A (en) * 1993-08-31 1996-12-10 Smc Kabushiki Kaisha Suction pad, rotation-stop and guide mechanism for the same
US5803447A (en) * 1996-09-25 1998-09-08 D&K Custom Machine Design, Inc. Method and apparatus for feeding sheets
US6161886A (en) * 1996-06-26 2000-12-19 Matsushita Electric Industrial Co., Ltd. Component mounting head
US20040139989A1 (en) * 2003-01-21 2004-07-22 Ilich Robert L. Egg lifting apparatus
US20070006940A1 (en) * 2005-07-11 2007-01-11 Maurice Perlman Auto-release vacuum device
US20070138733A1 (en) * 2005-12-16 2007-06-21 Chris Gray Pick mechanism
US20100150743A1 (en) * 2008-12-12 2010-06-17 Norgren Automotive, Inc. Single Line Venturi Apparatus
US20170085029A1 (en) * 2014-05-05 2017-03-23 Zte Corporation Attraction device and connector

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD203034A1 (de) * 1981-11-16 1983-10-12 Karl Marx Nachgreifer fuer auslagen von bogendruckmaschinen
DE3938556C2 (de) * 1989-11-21 1996-09-05 Heidelberger Druckmasch Ag Saugkopf für den Anleger einer Bogenrotationsdruckmaschine
DE4012778C1 (sv) * 1990-04-21 1991-05-29 Heidelberger Druckmaschinen Ag, 6900 Heidelberg, De
DE4324552C2 (de) * 1993-07-22 1998-12-17 Roland Man Druckmasch Vorrichtung zum Fördern von Bogen
DE19752491C2 (de) * 1997-11-27 2001-02-01 Roland Man Druckmasch Sauger

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB716791A (en) * 1951-06-06 1954-10-13 Linotype Machinery Ltd Improvements in or relating to apparatus for use in separating sheets

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE7022786U (de) * 1900-01-01 Heidelberger Druckmaschinen Ag Kombinierter Trenn- und Fördersauger für pneumatische Bogenanlegevorrichtungen
DE2132434B1 (de) * 1971-06-30 1972-12-14 Mabeg Maschb Gmbh Nachf Hense Trenn- und Foerdersauger am Saugkopf fuer Bogenanleger

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB716791A (en) * 1951-06-06 1954-10-13 Linotype Machinery Ltd Improvements in or relating to apparatus for use in separating sheets

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4480826A (en) * 1982-03-11 1984-11-06 Hamada Printing Press Mfg. Co., Ltd. Paper feeder
US4640503A (en) * 1984-05-28 1987-02-03 Veb Kombinat Polygraph "Werner Lamberz" Leipzig Sheet-separating and conveying suction device
US5582450A (en) * 1993-08-31 1996-12-10 Smc Kabushiki Kaisha Suction pad, rotation-stop and guide mechanism for the same
US5707093A (en) * 1993-08-31 1998-01-13 Smc Kabushiki Kaisha Suction pad, rotation--stop and guide mechanism for the same
US5904387A (en) * 1993-08-31 1999-05-18 Smc Kabushiki Kaisha Suction pad, rotation-stop and guide mechanism for the same
US6161886A (en) * 1996-06-26 2000-12-19 Matsushita Electric Industrial Co., Ltd. Component mounting head
US5803447A (en) * 1996-09-25 1998-09-08 D&K Custom Machine Design, Inc. Method and apparatus for feeding sheets
US20040139989A1 (en) * 2003-01-21 2004-07-22 Ilich Robert L. Egg lifting apparatus
US7083208B2 (en) * 2003-01-21 2006-08-01 Embrex, Inc. Vacuum assisted egg lifting apparatus having venturi assembly
US20090217998A1 (en) * 2005-07-11 2009-09-03 Delaware Capital Formation, Inc. Auto-Release Vacuum Device
US7950422B2 (en) 2005-07-11 2011-05-31 Delaware Capital Formations, Inc. Auto-release vacuum device
US7540309B2 (en) 2005-07-11 2009-06-02 Delaware Capital Formation, Inc. Auto-release vacuum device
US11148301B2 (en) 2005-07-11 2021-10-19 Delaware Capital Formation, Inc. Auto-release vacuum device
US7681603B2 (en) 2005-07-11 2010-03-23 Deleware Capital Formation, Inc. Auto-release vacuum device
US20070006940A1 (en) * 2005-07-11 2007-01-11 Maurice Perlman Auto-release vacuum device
US20100207409A1 (en) * 2005-07-11 2010-08-19 Delaware Capital Formation, Inc. Auto-Release Vacuum Device
US10654177B2 (en) 2005-07-11 2020-05-19 Delaware Capital Formation, Inc. Auto-release vacuum device
US20110220241A1 (en) * 2005-07-11 2011-09-15 Delaware Capital Formation, Inc. Auto-Release Vacuum Device
US8201589B2 (en) 2005-07-11 2012-06-19 Delaware Capital Formation, Inc. Auto-release vacuum device
US8479781B2 (en) 2005-07-11 2013-07-09 Delaware Capital Formation, Inc. Auto-release vacuum device
US9095983B2 (en) 2005-07-11 2015-08-04 Delaware Capital Formation, Inc. Auto-release vacuum device
US11951611B2 (en) 2005-07-11 2024-04-09 Delaware Capital Formation, Inc. Auto-release vacuum device
US9833910B2 (en) 2005-07-11 2017-12-05 Delaware Capital Formation, Inc. Auto-release vacuum device
US11577407B2 (en) 2005-07-11 2023-02-14 Delaware Capital Formation, Inc. Auto-release vacuum device
US20070138733A1 (en) * 2005-12-16 2007-06-21 Chris Gray Pick mechanism
US20100150743A1 (en) * 2008-12-12 2010-06-17 Norgren Automotive, Inc. Single Line Venturi Apparatus
US10103480B2 (en) * 2014-05-05 2018-10-16 Zte Corporation Attraction device and connector
US20170085029A1 (en) * 2014-05-05 2017-03-23 Zte Corporation Attraction device and connector

Also Published As

Publication number Publication date
SU591336A1 (ru) 1978-02-05
DE2409528A1 (de) 1975-01-16
DE2409528C2 (de) 1982-08-19
IT1014420B (it) 1977-04-20
DD106018A1 (sv) 1974-05-20

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